Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
lai cuu » lai cua, lai chau, lai cuoc
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) or (ban hanh)) lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) OR (ban hanh)) lai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang o hoi. hieu ve cham xuc ((van hanh) or (ban hanh)) lai cuu tre*.